ELECTRONIC DEVICE AND METHOD FOR ADJUSTING VOLUME LEVELS OF AUDIO SIGNAL OUTPUTTED BY THE ELECTRONIC DEVICE

摘要

An electronic device includes an audio sensor, an audio output unit, a pulse width modulation (PWM) unit connected to the audio output unit, and a control chip. When the audio output unit outputs the audio signal, the audio sensor detects a volume level of the environment sound. The control chip determines a volume level of the audio signal according to the volume level of the environment sound and preset associations between volume levels of the audio signal outputted by the audio output unit and volume levels of the environment, and determines a duty cycle of the PWM unit according to the determined volume level and the maximum volume level. The control chip then outputs the duty cycle to the PWM unit, to adjust a current volume level of the audio signal outputted by the audio output unit to the determined volume level.

主权项

1. A method for adjusting volume levels of an audio signal outputted by an electronic device, comprising:
setting associations between volume levels of an audio signal outputted by an audio output unit of the electronic device and volume levels of an environment sound, and setting a maximum volume level bearable to users; receiving a volume level of the environment sound detected by an audio sensor of the electronic device when the audio output unit outputs the audio signal; determining a volume level of the audio signal outputted by the audio output unit according to the volume level of the environment sound and the associations; determining a duty cycle of a pulse width modulation (PWM) unit connected to the audio output unit according to the determined volume level of the audio signal and the maximum volume level bearable to users; and outputting the duty cycle to the PWM unit to adjust a current volume level of the audio signal to the determined volume level.